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El metabolismo compartimentado apoya el desarrollo de los mamíferos de gestación media
Ashley Solmonson1, Brandon Faubert1,2, Wen Gu1
1Children's Medical Center Research Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature
|April 7, 2022
Resumen
La embriogénesis de los mamíferos se basa en la regulación metabólica. Este estudio revela distintos programas metabólicos en el desarrollo del embrión y la placenta, destacando las transiciones críticas y la utilización de nutrientes durante la gestación.
Área de la Ciencia:
- Biología del desarrollo
- Metabolomía
- La bioquímica
Sus antecedentes:
- La embriogénesis de los mamíferos requiere un control metabólico preciso para un crecimiento rápido.
- La gestación implica un aumento del suministro de nutrientes y oxígeno que apoya el desarrollo de los órganos fetales.
- La observación del metabolismo in utero es crucial para comprender el apoyo al desarrollo.
Objetivo del estudio:
- Identificar los programas metabólicos en evolución en la placenta y el embrión durante la gestación del ratón.
- Para entender cómo el metabolismo apoya el desarrollo fetal en el útero.
- Investigar las consecuencias metabólicas de la deficiencia de LIPT1 durante la embriogénesis.
Principales métodos:
- Se utilizó el rastreo de isótopos y la metabolomía para analizar las vías metabólicas.
- Diferencias metabólicas examinadas entre los tejidos de la placenta y el embrión.
- Se estudiaron ratones con deficiencia de LIPT1 para modelar los defectos metabólicos.
Principales resultados:
- Los días gestacionales identificados (DG) 10,5-11,5 son un período clave de transición metabólica tanto para el embrión como para la placenta.
- Reveló un metabolismo distinto de carbohidratos y una síntesis de purinas dependientes de la glucosa en el embrión.
- Programas metabólicos compartimentados observados dentro de los órganos embrionarios por GD12.5.
- Se demostró que la deficiencia de LIPT1 interrumpe el metabolismo del ciclo del ácido tricarboxílico (TCA), lo que lleva a defectos de desarrollo y muerte embrionaria.
Conclusiones:
- La placenta y el embrión exhiben programas metabólicos distintos y en evolución durante la gestación.
- La glucosa es una fuente de combustible crítica para la síntesis de purinas y el ciclo de TCA en el embrión en desarrollo.
- La interrupción de la activación de la enzima del ciclo TCA (deficiencia de LIPT1) afecta gravemente el desarrollo y la viabilidad embrionaria.
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